350-501 MPLS and Segment Routing Practice Question
In MPLS, which operation occurs when a router receives a labeled packet and replaces the top label with a new label before forwarding?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Swap
In MPLS, the swap operation replaces the incoming top label with a new outgoing label as per the LFIB entry.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Lookup
Why it's wrong here
Lookup is not an MPLS operation; it's an IP forwarding step.
- ✗
Pop
Why it's wrong here
Pop removes the top label.
- ✓
Swap
Why this is correct
Swap exchanges the top label for a new one.
- ✗
Push
Why it's wrong here
Push adds a new label to the stack.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-501 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-501 exam.